<template>
  <div>
<!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
<!--    卡片视图区域-->
    <el-card>
<!--      提示区域-->
      <el-alert
              title="添加商品信息"
              type="info"
              center
              show-icon
              :closable="false">
      </el-alert>
<!--      步骤条区域-->
      <el-steps :space="200"
                :active="activeIndex - 0"
                finish-status="success"
                align-center>
        <!--:active="0"表示激活第一项（即激活基本信息）-->
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

<!--      tab栏区域-->
      <el-form :model="addForm"
               :rules="addFromRules"
               ref="addFormRef"
               label-width="100px"
               label-position="top">
       <!--label-position="top"指定label在文本框之上-->
      <el-tabs v-model="activeIndex"
               :tab-position="'left'"
               :before-leave="beforeTabLeave"
               @tab-click="tabClicked">
      <!--:before-leave表示切换标签之前的钩子，若返回false或返回Promise且被reject则阻止切换-->
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <!--label指定标题名称，prop绑定校验规则-->
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
            <!--type="number"规定只能输入数字-->
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader v-model="addForm.goods_cat"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"></el-cascader>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
<!--          渲染表单的item项-->
          <el-form-item :label="item.attr_name"
                        v-for="item in manyTableData"
                        :key="item.attr_id">
<!--            复选框组-->
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox :label="cb"
                           v-for="(cb, i) in item.attr_vals"
                           :key="i"
                           border></el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item label="item.attr_name"
                        v-for="item in onlyTableData"
                        :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <el-upload action="https://127.0.0.1：8888/api/private/v1/upload"
                  :on-preview="handlePreview"
                  :on-remove="handleRemove"
                  list-type="picture"
                  :headers="headerObj"
                  :on-success="handleSuccess">
             <!--
             action=""指图片要上传到的后台API地址
             list-type指定渲染出的ui效果
             -->
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
<!--          富文本编辑器组件-->
          <quill-editor v-model="addForm.goods_introduce"></quill-editor>
<!--          添加商品的按钮-->
          <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>

<!--    图片预览-->
    <el-dialog title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
      <img :src="perviewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'

  export default {
    data(){
      return {
        activeIndex: '0',
        //添加商品的表单数据对象
        addForm: {
          goods_name:'',
          goods_price: 0,
          goods_weight:0,
          goods_number:0,
          //商品所属的分类数组
          goods_cat:[],
          //图片的数组
          pics:[],
          //商品的详情描述
          goods_introduce:'',
          attrs:[]
        },
        addFromRules:{
          goods_name:[
            {required: true , message:'请输入商品名称', trigger: 'blur'}
          ],
          goods_price:[
            {required: true , message:'请输入商品价格', trigger: 'blur'}
          ],
          goods_weight:[
            {required: true , message:'请输入商品重量', trigger: 'blur'}
          ],
          goods_number:[
            {required: true , message:'请输入商品数量', trigger: 'blur'}
          ],
          goods_cat:[
            {required: true , message:'请选择商品分类', trigger: 'blur'}
          ]
        },
        //商品分类列表
        catelist:[],
        cateProps:{
          label:'cat_name',
          value:'cat_id',
          children:'children'
        },
        //动态参数列表数据
        manyTableData:[],
        //静态属性列表数据
        onlyTableData:[],
        //图片上传组件的headers请求头对象
        headerObj:{
          Authorization:window.sessionStorage.getItem('token')
        },
        perviewPath:'',
        previewVisible: false
      }
    },
    created(){
      this.getCateList()
    },
    methods:{
      //获取所有商品分类数据
      async getCateList(){
        const {data:res} = await this.$http.get(`categories`)

        if(res.meta.status !== 200){
          return this.$message.error('获取商品分类数据失败!')
        }

        this.catelist = res.data
        console.log(this.catelist);
      },
      //级联选择器中项的变化会触发这个函数
      handleChange(){
        console.log(this.addForm.goods_cat);
        if(this.addForm.goods_cat.length !== 3){
          this.addForm.goods_cat = []
        }
      },



      beforeTabLeave(activeName,oldActiveName){
        // console.log('即将离开的标签页名字是：' + oldActiveName);
        // console.log('即将进入的标签页名字是：' + activeName);
        // return false
        if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
          this.$message.error('请先选择商品分类！')
          return false
        }
      },



      async tabClicked(){
        // console.log(this.activeIndex);
        //证明访问的是动态参数面板
        if(this.activeIndex === '1'){
          const { data:res } = await this.$http.get(`calegories/${this.cateId}/attributes`,{
            params:{ sel:'many' }
          })
          if(res.meta.status !== 200){
            return this.$message.error('获取动态参数列表失败！')
          }

          console.log(res.data);
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length ===0 ?
                [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
        }else if(this.activeIndex === '2'){
          const { data:res } = await this.$http.get(`calegories/${this.cateId}/attributes`,{
            params:{ sel:'only' }
          })
          if(res.meta.status !== 200){
            return this.$message.error('获取静态属性失败！')
          }

        console.log(res.data);
          this.onlyTableData = res.data
        }
      },
      //处理图片预览效果
      handlePreview(file){
        console.log(file);
        this.perviewPath = file.response.data.url
        this.previewVisible = true
      },
      //处理移除图片的操作
      handleRemove(file){
        //console.log(file);
        //1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        //2.从pics数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x =>
            x.pic === filePath)
        //3.调用数组的splice方法，把图片信息对象，从pics数组中移除
        this.addForm.pics.splice(i,1)
        console.log(this.addForm);
      },
      //监听图片上传成功的事件
      handleSuccess(response){
        console.log(response);
        //1.拼接得到一个图片信息对象
        const picInfo = { pic: response.data.tmp_path }
        //2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
        console.log(this.addForm);
      },
      //添加商品
      add(){
        this.$refs.addFormRef.validate(async valid => {
          if(!valid){
            return this.$message.error('请填写必要的表单项！')
          }
          //执行添加的业务逻辑
          //lodash cloneDeep(Obj)
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          //处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {attr_id: item.attr_id,
              attr_value:item.attr_vals.join(' ')}
            this.addForm.attrs.push(newInfo)
          })
          //处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = { attr_id:item.attr_id,
            attr_value: item.attr_vals}
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form);

          //发起请求添加商品
          //商品的名称，必须是唯一的
          const {data:res} = await this.$http.post('goods',form)

          if(res.meta.status !== 201){
            return this.$message.error('添加商品失败！')
          }

          this.$message.success('添加商品成功！')
          //跳转到/goods页
          this.$router.push('/goods')
        })
      }
    },
    computed:{
      cateId(){
        if(this.addForm.goods_cat.length === 3){
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style lang="less" scoped>
  .el-steps {
    margin: 15px 0;
  }

  .el-step_tite {
    font-size:13px;
  }

  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }

  .previewImg {
    width: 100%;
  }

  .btnAdd {
    margin-top: 15px;
  }
</style>